package com.btkjgc.utils;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;

public class ExcelExportor<T>
{
	public void exportExcel(String title, String[] headers,
			Collection<T> dataset, OutputStream out, String[] totalRow)
	{
		exportExcel(title, headers, dataset, out, "yyyy-MM-dd HH:mm:ss",
				totalRow);
	}

	DecimalFormat fnum = new DecimalFormat("##0.00");

	/**
	 * 这是一个通用的方法，利用了JAVA的反射机制，可以将放置在JAVA集合中并且符号一定条件的数据以EXCEL 的形式输出到指定IO设备上
	 * 
	 * @param title
	 *            表格标题名
	 * @param headers
	 *            表格属性列名数组
	 * @param dataset
	 *            需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。此方法支持的
	 *            javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据)
	 * @param out
	 *            与输出设备关联的流对象，可以将EXCEL文档导出到本地文件或者网络中
	 * @param pattern
	 *            如果有时间数据，设定输出格式。默认为"yyy-MM-dd"
	 */
	@SuppressWarnings({ "unchecked", "deprecation" })
	public void exportExcel(String title, String[] headers,
			Collection<T> dataset, OutputStream out, String pattern,
			String[] totalRow)
	{
		// 声明一个工作薄
		HSSFWorkbook workbook = new HSSFWorkbook();
		// 生成一个表格
		HSSFSheet sheet = workbook.createSheet(title);
		// 设置表格默认列宽度为15个字节
		sheet.setDefaultColumnWidth((short) 22);
		// 生成一个样式
		HSSFCellStyle style = workbook.createCellStyle();
		// 设置这些样式
		style.setFillForegroundColor(HSSFColor.WHITE.index);
		style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		style.setBorderRight(HSSFCellStyle.BORDER_THIN);
		style.setBorderTop(HSSFCellStyle.BORDER_THIN);
		style.setAlignment(HSSFCellStyle.ALIGN_CENTER);

		// 生成一个字体
		HSSFFont font = workbook.createFont();
		font.setColor(HSSFColor.BLACK.index);
		font.setFontHeightInPoints((short) 12);
		font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
		// 把字体应用到当前的样式
		style.setFont(font);
		// 生成并设置另一个样式
		HSSFCellStyle style2 = workbook.createCellStyle();
		style2.setFillForegroundColor(HSSFColor.WHITE.index);
		style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		style2.setBorderRight(HSSFCellStyle.BORDER_THIN);
		style2.setBorderTop(HSSFCellStyle.BORDER_THIN);
		style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
		style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
		// 生成另一个字体
		HSSFFont font2 = workbook.createFont();
		font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
		// 把字体应用到当前的样式
		style2.setFont(font2);

		// 声明一个画图的顶级管理器
		HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
		// // 定义注释的大小和位置,详见文档
		// HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,
		// 0, 0, 0, (short) 4, 2, (short) 6, 5));
		// // 设置注释内容
		// comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));
		// // 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.
		// comment.setAuthor("leno");

		// 产生表格标题行
		if (headers != null)
		{
			HSSFRow row = sheet.createRow(0);
			row.setHeight((short) 360);
			for (short i = 0; i < headers.length; i++)
			{
				HSSFCell cell = row.createCell(i);
				cell.setCellStyle(style);
				HSSFRichTextString text = new HSSFRichTextString(headers[i]);
				cell.setCellValue(text);
			}
		}

		// 遍历集合数据，产生数据行
		Iterator<T> it = dataset.iterator();
		int index = 0;
		while (it.hasNext())
		{
			index++;
			HSSFRow row = sheet.createRow(index);
			row.setHeight((short) 360);
			T t = (T) it.next();

			if (t instanceof String[])
			{
				String[] cellvalues = (String[]) t;
				for (short i = 0; i < cellvalues.length; i++)
				{
					HSSFCell cell = row.createCell(i);
					cell.setCellStyle(style2);
					cell.setCellValue(cellvalues[i]);
				}
			}
			else
			{
				Field[] fields = t.getClass().getDeclaredFields();
				for (short i = 0; i < fields.length; i++)
				{
					HSSFCell cell = row.createCell(i);
					cell.setCellStyle(style2);
					Field field = fields[i];
					String fieldName = field.getName();
					String getMethodName = "get"
							+ fieldName.substring(0, 1).toUpperCase()
							+ fieldName.substring(1);
					try
					{
						@SuppressWarnings("rawtypes")
						Class tCls = t.getClass();
						Method getMethod = tCls.getMethod(getMethodName,
								new Class[] {});
						Object value = getMethod.invoke(t, new Object[] {});
						// 判断值的类型后进行强制类型转换
						String textValue = null;
						if (value instanceof Integer)
						{
							cell.setCellValue((Integer) value);
						}
						else if (value instanceof Float)
						{
							cell.setCellValue(fnum.format((float) value));
						}
						else if (value instanceof Double)
						{
							cell.setCellValue(fnum.format((double) value));
						}
						else if (value instanceof Long)
						{
							long longValue = (Long) value;
							cell.setCellValue(longValue);
						}
						else if (value instanceof Boolean)
						{
							boolean bValue = (Boolean) value;
							textValue = "是";
							if (!bValue)
							{
								textValue = "否";
							}
							cell.setCellValue(textValue);
						}
						else if (value instanceof Date)
						{
							Date date = (Date) value;
							SimpleDateFormat sdf = new SimpleDateFormat(pattern);
							textValue = sdf.format(date);
							cell.setCellValue(textValue);
						}
						else if (value instanceof byte[])
						{
							// 有图片时，设置行高为60px;
							row.setHeightInPoints(60);
							// 设置图片所在列宽度为80px,注意这里单位的一个换算
							sheet.setColumnWidth(i, (short) (35.7 * 80));
							// sheet.autoSizeColumn(i);
							byte[] bsValue = (byte[]) value;
							HSSFClientAnchor anchor = new HSSFClientAnchor(0,
									0, 1023, 255, (short) 6, index, (short) 6,
									index);
							anchor.setAnchorType(2);
							patriarch.createPicture(anchor, workbook
									.addPicture(bsValue,
											HSSFWorkbook.PICTURE_TYPE_JPEG));
						}
						else if (value != null)
						{
							textValue = value.toString();
							HSSFRichTextString richString = new HSSFRichTextString(
									textValue);
							HSSFFont font3 = workbook.createFont();
							font3.setColor(HSSFColor.BLACK.index);
							richString.applyFont(font3);
							cell.setCellValue(richString);
						}
					}
					catch (Exception e)
					{
						e.printStackTrace();
					}
				}
			}
		}

		if (totalRow != null)
		{
			HSSFRow row = sheet.createRow(dataset.size() + 1);
			for (short i = 0; i < totalRow.length; i++)
			{
				HSSFCell cell = row.createCell(i);
				cell.setCellStyle(style);
				HSSFRichTextString text = new HSSFRichTextString(totalRow[i]);
				cell.setCellValue(text);
			}
		}
		try
		{
			workbook.write(out);
			out.close();
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
	}
}
